The Sprinter (also called ZX-Sprinter) is a microcomputer made by Russian Peters Plus, Ltd.; it is the last model of ZX Spectrum being produced in a factory. It's built using what the company calls a "Flex architecture". This uses an Altera PLD as part of the core logic, allowing the machine's hardware to be reconfigured on the fly for several ZX-Spectrum models' compatibility or its own enhanced native mode (hardly used). This is comparable to the design of Jeri Ellsworth's C-One reprogrammable computer.[citation needed]